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INDICATOR POSITION DETECTING DEVICE AND INDICATOR POSITION DETECTING METHOD

  • US 20110241651A1
  • Filed: 02/10/2011
  • Published: 10/06/2011
  • Est. Priority Date: 03/30/2010
  • Status: Active Grant
First Claim
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1. An indicator position detecting device, comprising:

  • a conductor pattern that is composed of a plurality of conductors disposed along a first direction and a plurality of conductors disposed along a second direction intersecting with the first direction, the conductor pattern being configured to detect position indication by an indicator,a multi-frequency signal supply circuit configured to supply a plurality of signals with different frequencies to the plurality of conductors disposed along the first direction,a frequency analyzing circuit configured to be supplied with signals from the plurality of conductors disposed along the second direction and to carry out frequency analysis of a signal based on position indication by the indicator with respect to the conductor pattern,an indicated-position detecting circuit configured to be supplied with a signal from the frequency analyzing circuit and to detect position indication by the indicator with respect to the conductor pattern,a noise analyzing circuit configured to carry out frequency analysis of a noise signal received by the conductor pattern, anda control circuit configured to control allocation of frequencies of multi-frequency signals supplied from the multi-frequency signal supply circuit to the plurality of conductors disposed along the first direction based on frequency analysis of a noise signal by the noise analyzing circuit.

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